关于javascript:罗马数字转换器

把传入的数字转为罗马数字

function convertToRoman(num) {  let numStr = "" + num,result = "";  for(let i = 0 ;i<numStr.length;i++){    result += NumToRoman(parseInt(numStr[i]),numStr.length - i)  }  return num;}function NumToRoman(num, length) {  let romanSymbol = ["I", "V", "X", "L", "C", "D", "M"];  let startIdx = 2 * (length - 1);  let curSymbol = [];  for (let i = 0; i < 3; i++) {    curSymbol.push(romanSymbol[startIdx + i]);  }  let result = "";  switch (num) {    case 1:      result = curSymbol[0];      break;    case 2:      result = curSymbol[0] + curSymbol[0];      break;    case 3:      result = curSymbol[0] + curSymbol[0] + curSymbol[0];      break;    case 4:      result = curSymbol[0] + curSymbol[1];      break;    case 5:      result = curSymbol[1];      break;    case 6:      result = curSymbol[1] + curSymbol[0];      break;    case 7:      result = curSymbol[1] + curSymbol[0] + curSymbol[0];      break;    case 8:      result = curSymbol[1] + curSymbol[0] + curSymbol[0] + curSymbol[0];      break;    case 9:      result = curSymbol[0] + curSymbol[2];      break;  }  return result;}convertToRoman(36);

思路:依据传入的数字位数,从罗马字符数组里截取3个，再依照传入数字进行组装，失去最终后果